9. shot (n.) a consecutive series of pictures that constitutes a unit of action in a film
The vacuum level is determined by the pressure differential between the evacuated volume and the surrounding atmosphere. Several units of measure can be used. Most refer to the height of a column of mercury â usually inches of mercury (in.-Hg) or millimeters of mercury (mm-Hg).
The size of each opening (free area) is determined by the. total BTUH input of all gas utilization equipment (i.e., water. heaters, furnaces, clothes dryers, etc.) and the method by. which the air is provided. The BTUH input can be found on.